中文版 | English
Title

Ultrafast Buildup Dynamics of Terahertz Pulse Generation in Mode-Locked Quantum Cascade Lasers

Author
Corresponding AuthorWang, Feihu; Dhillon, Sukhdeep S.
Publication Years
2022-12-19
DOI
Source Title
ISSN
2331-7019
Volume18Issue:6
Abstract

Ultrashort terahertz pulse generation is essential for a range of proven terahertz applications, from time-resolved spectroscopy of fundamental excitations to nondestructive testing and imaging. Recently, it has been shown that semiconductor-based terahertz quantum cascade lasers (QCLs) can be used to generate pulses as short as a few picoseconds through active mode locking. However, further progress for subpicosecond and high peak power pulse generation is hampered by poor knowledge on how the electric field actually forms in these lasers. Here, we theoretically and experimentally show the amplitudeand phase-resolved buildup of pulse generation through active mode locking, from initiation of pulse generation to the nanosecond steady state. The experimental results, using an ultrafast coherent seeding technique to probe the laser from femtosecond to nanosecond time scales, are in full agreement with the theoretical calculations based on a theoretical model using multimode reduced rate equations. In particular, we show that the electric field buildup to achieve short pulse operation is extremely fast, requiring only a few photon round trips, owing to the ultrafast gain dynamics of the lasers. Further, this shows a gain recovery time of the order of a few picoseconds, an order of magnitude smaller than the photon roundtrip time, highlighting that terahertz QCLs are categorically class-A lasers. This demonstration marks an important formulism for future progress towards exploring the ultrafast pulse generation buildup dynamics of these complex semiconductor lasers.

URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
Corresponding
Funding Project
European Union[964735] ; French National Research Agency[ANR-18-CE24-0013-02] ; Australian Research Council Discovery Project[
WOS Research Area
Physics
WOS Subject
Physics, Applied
WOS Accession No
WOS:000903513300002
Publisher
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/425170
DepartmentInstitute for Quantum Science and Engineering
Affiliation
1.Univ Paris, Sorbonne Univ, Univ PSL, Lab Phys Ecole Normale Super,CNRS,ENS, Paris, France
2.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
3.Int Quantum Acad, Shenzhen 518048, Peoples R China
4.Southern Univ Sci & Technol, Guangdong Prov Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China
5.Univ Queensland, Sch Informat Technol & Elect Engn, Brisbane, Qld 4072, Australia
6.Univ Leeds, Sch Elect & Elect Engn, Woodhouse Lane, Leeds, England
First Author AffilicationInstitute for Quantum Science and Engineering
Corresponding Author AffilicationInstitute for Quantum Science and Engineering
Recommended Citation
GB/T 7714
Wang, Feihu,Qi, Xiaoqiong,Pistore, Valentino,et al. Ultrafast Buildup Dynamics of Terahertz Pulse Generation in Mode-Locked Quantum Cascade Lasers[J]. Physical Review Applied,2022,18(6).
APA
Wang, Feihu.,Qi, Xiaoqiong.,Pistore, Valentino.,Li, Lianhe.,Agnew, Gary.,...&Dhillon, Sukhdeep S..(2022).Ultrafast Buildup Dynamics of Terahertz Pulse Generation in Mode-Locked Quantum Cascade Lasers.Physical Review Applied,18(6).
MLA
Wang, Feihu,et al."Ultrafast Buildup Dynamics of Terahertz Pulse Generation in Mode-Locked Quantum Cascade Lasers".Physical Review Applied 18.6(2022).
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